[PATCH] keys, dns: Fix size check of V1 server-list header
Petr Vorel
pvorel at suse.cz
Sun Jan 21 23:32:20 PST 2024
From: Sedat Dilek <sedat.dilek at gmail.com>
On Wed, Jan 10, 2024 at 10:12 PM David Howells <dhowells at redhat.com> wrote:
>
>
> Fix the size check added to dns_resolver_preparse() for the V1 server-list
> header so that it doesn't give EINVAL if the size supplied is the same as
> the size of the header struct (which should be valid).
>
> This can be tested with:
>
> echo -n -e '\0\0\01\xff\0\0' | keyctl padd dns_resolver desc @p
>
> which will give "add_key: Invalid argument" without this fix.
>
> Fixes: 1997b3cb4217 ("keys, dns: Fix missing size check of V1 server-list header")
[ CC stable at vger.kernel.org ]
Your (follow-up) patch is now upstream.
https://git.kernel.org/linus/acc657692aed438e9931438f8c923b2b107aebf9
This misses CC: Stable Tag as suggested by Linus.
Looks like linux-6.1.y and linux-6.6.y needs it, too.
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.11&id=da89365158f6f656b28bcdbcbbe9eaf97c63c474
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.1.72&id=079eefaecfd7bbb8fcc30eccb0dfdf50c91f1805
BG,
-Sedat-
Hi Greg, Sasa,
could you please add this also to linux-6.1.y and linux-6.6.y? (Easily
applicable to both, needed for both.) Or is there any reason why it's not
being added?
Kind regards,
Petr
> Reported-by: Pengfei Xu <pengfei.xu at intel.com>
> Link: https://lore.kernel.org/r/ZZ4fyY4r3rqgZL+4@xpf.sh.intel.com/
> Signed-off-by: David Howells <dhowells at redhat.com>
> cc: Edward Adam Davis <eadavis at qq.com>
> cc: Linus Torvalds <torvalds at linux-foundation.org>
> cc: Simon Horman <horms at kernel.org>
> Cc: Jarkko Sakkinen <jarkko at kernel.org>
> Cc: Jeffrey E Altman <jaltman at auristor.com>
> Cc: Wang Lei <wang840925 at gmail.com>
> Cc: Jeff Layton <jlayton at redhat.com>
> Cc: Steve French <sfrench at us.ibm.com>
> Cc: Marc Dionne <marc.dionne at auristor.com>
> Cc: "David S. Miller" <davem at davemloft.net>
> Cc: Eric Dumazet <edumazet at google.com>
> Cc: Jakub Kicinski <kuba at kernel.org>
> Cc: Paolo Abeni <pabeni at redhat.com>
> ---
> net/dns_resolver/dns_key.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/dns_resolver/dns_key.c b/net/dns_resolver/dns_key.c
> index f18ca02aa95a..c42ddd85ff1f 100644
> --- a/net/dns_resolver/dns_key.c
> +++ b/net/dns_resolver/dns_key.c
> @@ -104,7 +104,7 @@ dns_resolver_preparse(struct key_preparsed_payload *prep)
> const struct dns_server_list_v1_header *v1;
>
> /* It may be a server list. */
> - if (datalen <= sizeof(*v1))
> + if (datalen < sizeof(*v1))
> return -EINVAL;
>
> v1 = (const struct dns_server_list_v1_header *)data;
>
>
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